[chimerax-users] Tubes

[Elaine Meng]

Hi Martin,
Only Conrad knows the details, but it is somehow automatically based on the distance of the CA atoms to the computed midline of the tube.

Currently there is no command option to control it.  I have also been bothered by this issue and a couple of weeks ago I opened a Chimera ticket (#585) to request that there be an option to set constant radius for these helix tubes.

I’ll add your name to the notification list for if/when there is any action on the ticket.
Best,
Elaine
----------
Elaine C. Meng, Ph.D. 
UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco


> On Apr 3, 2017, at 11:07 AM, Tom Goddard <goddard at sonic.net> wrote:
> 
> Hi Martin,
> 
>   That is odd, I didn’t know the helix cylinder diameters varied in ChimeraX.  I don’t know the algorithm or how to change the diameter.  Maybe Conrad (who wrote the code) or Elaine will know.  There is a chimerax-users at cgl.ucsf.edu mailing list that you can ask such questions on.
> 
> 	Tom
> 
> 
>> On Apr 3, 2017, at 10:40 AM, Martin Moncrieffe wrote:
>> 
>> Hi Tom,
>> 
>> When displaying helices as tubes, can one set the radius of the tubes? I’ve noticed that depending on the structure, the tube diameter is scaled scaled differently even though the docs state that w/h/x-secton do not apply in tube mode. I’m sure you guys have some fancy algorithm to do so. 
>> 
>> Anyway, I really like what you’re all doing so far.
>> 
>> Best.
>> 
>> __martin